Our girls are about five months old now. We live in Northern California. Right now it gets light at about 7:00 and dark at about 5:30. I've read that hens need 14 hours of light per day for optimal laying. I've also read that hens that come to maturity in the winter won't start laying until the following spring. We'd like to put a light and a timer in the coop to extend the daylight hours. I think we'll have it turn on at 4:00 AM and turn off at 7:00 AM. That will give us 13.5 - 14 hours of light. My question is, what wattage should the light bulb be? Any other considerations? Thanks.